Combined adaptor & port protector

Abstract: The adaptor (10) has an open end closed by a protector (40) and an opposite end housing an injection site (46), the opposite end engages with a tubular member (32) for coupling to a port of a container. An intermediate portion (54) has a tapering interior portion to direct a cannula, inserted in the open end, to the injection site. The protector (40) has a cap portion (20) and plug portion (26), which plugs the open end. A ring (14) can be manually pulled to remove the protector from the adaptor.

Description: BACKGROUND OF THE INVENTION The present invention relates to a combined adaptor and port protector attachable to an end of a tubular port for receiving a cannula and maintaining it in a sterile environment. Housing medical solutions and products in flexible plastic containers is, of course, known. These containers provide a means for housing the solution prior to the solution being administered to a patient or used for other therapeutic applications. Likewise, it is known to house a variety of solutions in such containers for a variety of medical procedures. Such solutions include intravenous, enteral, and peritoneal solutions. In this regard, flexible containers are used for peritoneal dialysis. In peritoneal dialysis, a dialysis solution is introduced into a patient's peritoneal cavity utilizing a catheter. After a sufficient period of time, an exchange of solutes between the dialysate and the blood is achieved. Fluid removal is achieved by providing a suitable osmotic gradient from the blood to the dialysate to permit water outflow from the blood. This allows a proper acid-base, electrolyte and fluid balance to be returned to the blood. The dialysis solution is simply drained from the body cavity through the catheter. In order to access the interior of a container, either to infuse solution therein or access a solution contained therein, it is known to provide containers with one or more ports or fitments. These ports are typically tubular in shape and define a flow path from an interior of the container to the outside environment. Such ports may include a pierceable membrane or injection site. In use, fluid is either added to the container or accessed therefrom by inserting a needle, cannula, or other member through the port piercing a membrane or an injection site. To prevent contamination of the solution, and infection to the patient, the transfer of solution out of the container, and in many instances into the container, must take place under sterile conditions. Therefore, the distal ends of the port or connector (e.g., cannula, luer connector, etc.) are frequently capped with a "port protector." The function of the port protector is to preserve the sterile integrity of the interior of the port or connector after the entire container assembly has been assembled and terminally sterilized. Most frequently, sterilization in the medical industry is through the use of steam sterilization. Steam sterilization typically takes place under elevated temperatures and pressures, such as, for example, 120°C (250°F). Currently, one method used to provide the necessary requirements of a port protector is to use a plastic sleeve, typically constructed from extruded flexible polyvinyl chloride, that is sealed off at one end with a slit opening cut along the longitudinal direction of the sleeve. During assembly, the sleeve is spread open at the slit and slipped onto the tube through the pre-slit opening. The sealed end is placed against the opening of the tube to provide the protective function. During steam sterilization, steam can penetrate through the sleeve so that a sufficient microbial kill is achieved. During use, ideally, the user or patient grabs the slit end of the sleeve and pulls it away from the tube to expose the tube for use. Although these pre-slit sleeves have been in use for many years, a number of issues with respect to the use of same exist. For example, frequently, the sleeve develops a strong tack with the tube during steam sterilization. This can make it very difficult to remove. Additionally, the thin walled slit part of the sleeve often becomes severely distorted during steam sterilization. This can make it extremely difficult for a patient with visual or manual impairment to remove the sleeve. Still further, the dimensions of the flexible sleeve are difficult to control. Accordingly, relaxations of the material may occur during the steam sterilization process, causing the sleeve to come off at a later time, thereby breaching the sterile barrier. Furthermore, during the extrusion manufacturing of the sleeve, die lines are frequently introduced in the longitudinal direction. This can reduce the sterile barrier, or at times, render the microbial barrier ineffective. Additionally, sometimes in systems with closed ends, pressure differentials are created during sterilization. These pressure differentials can blow off the sleeve, destroying the sterile barrier. One approach that has been used in an attempt to overcome the disadvantages of the sleeve is to use an injection molded cap to ensure the sterility of the surfaces under the protector cap. An example of such a cap is set forth in US-A-4,572,980. Injection sites which allow for the introduction of intraperitoneally administered drugs into a solution bag including the admixture of non-shelf stable nutrients and reconstituted medications are known. Prior injection sites, however, often are positioned at a distance from the solution bag requiring squeezing of the port tube to mix the drug. Often, injection sites are small in cross-sectional areas such that a needle, cannula or other injection device, may not properly penetrate the injection site. As a result, accidental needle sticks of a user or misplaced injections through the injection site and/or other membrane often takes place. In addition, accidental puncturing of a wall of the solution bag often results. A need, therefore, exists for an improved medication port, adaptor and protector for a container assembly, such as a solution bag used in peritoneal dialysis. SUMMARY OF THE INVENTION The present invention provides an improved adaptor for receiving a cannula, which includes a needle or other injection device, for connection to a tubular member defining or attached to a port of a container. US-A-4303067 discloses an additive port for injection of medication into a bag through a puncturable resealable injection site. The additive port includes a tubular member with an adaptor attached to it. The adaptor houses the injection site and has a constant cross-section bore, which receives a cannula and guides the cannula to the injection site. US-A-4256333 discloses an adaptor, which has a portion insertable in a port tube and having a puncturable end within the tube. The portion has a slight inner and outer taper and is closed by a removable cap. The precharacterising part of Claim 1 is based on the disclosure of US-A-4256333 and the distinguishing features of the invention are set out the characterising part of Claim 1. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a perspective view of the protector and adaptor connected to a container having a plurality of ports. Figure 2 illustrates a top plan view of the protector. Figure 3 illustrates a bottom plan view of the protector. Figure 4 illustrates a cross-sectional view of the protector, taken generally along lines IV-IV of Figure 3. Figure 5 illustrates a cross-sectional view of a membrane tube for use in a port of the container of Figure 1. Figure 6 illustrates a perspective view of an adaptor for connection to a port at one end and to a protector at an opposite end. Figure 7 illustrates a top plan view of the adaptor of Figure 6. Figure 8 is a cross-sectional view of the adaptor taken generally along lines VIII-VIII of Figure 6. Figure 9 illustrates a cross-sectional view of an injection site within the adaptor connected to a membrane tube and protector. DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS As used herein, "adaptor" refers to a device for connecting to a port or membrane tube on a container, and "protector" refers to a device for maintaining a sterile barrier at one end of the adaptor opposite the other end of the adaptor which connects to the port or membrane tube so as to maintain a sterile barrier at an opening of a tubular member that provides a fluid path from an interior to a second environment. Therefore, the adaptor of the present invention can be used on a wide variety of ports or tubes located on containers or remote from containers, and the protector can be used on the adaptor of the present invention, as well as the port directly or other fitments or luer connectors at the end of a fluid line. Referring now to Figure 1, a container 1 is illustrated having a protector 10 and an adaptor 40 intermediate the protector 10 and a port 12a of the container 1. The container 1 may include other ports 12b and 12c as required for the particular application and use of the container 1. As illustrated, a user 2 can selectively remove the protector 10 from the adaptor 40 with the assistance of a pull ring 14. Referring now to Figures 2-4, an embodiment of the protector 10 is illustrated. The protector 10 includes a cap 20 and the pull ring 14. The cap 20 includes legs 16 and 18 and a top 22. In an embodiment, the top 22 of the protector 10 may be sufficiently thin and of adequate composition, such as a thermoplastic elastomer, to allow steam to penetrate the top 22 and enter an interior of a connector, such as a passageway of the adaptor 40 illustrated in Figures 6-8 and which will be further described hereinafter. In the alternative, the protector 10 may be an injection molded polyvinyl chloride material. When the cap 20 is constructed from a thermoplastic elastomer, the cap 20 will allow steam to penetrate the top 22 of the cap 20 and enter an interior of the adaptor 40, for example, to which the protector 10 is secured. The adaptor may be made from materials as disclosed in EP-A-0654988. Preferably, the protector 10 includes the pull ring 14. The pull ring 14 extends from the legs 16 and 18 at a base of a peripheral sidewall 24. Preferably, a plane defined by the pull ring 14 is parallel to a plane defined by the top 22 of the cap 20. Therefore, a simplified mold can be used that only includes two mating halves. The inner surface of the cap 20 includes a plug member 26. The plug member 26 ensures a good seal with the interior diameter of the adaptor 40 or port 12a over which the protector 10 may be removably sealed. A peripheral recessed ring 28 within the interior of the protector 10 and about the plug member 26 is designed to securely mate with the exterior wall of the adaptor 40 at one end of the adaptor 40. The pull ring 14 as illustrated in Figures 2-4 is a "D" shape. However, other shapes and configurations may be implemented. The top 22 of the adaptor 10 may include a recessed portion 30. The recessed portion 30 partially forms the plug member 26 within the interior of the protector 10. If desired, means can be provided on the protector 10 for allowing a patient or other user 2 to identify the contents. This means can include color coding of at least a portion of the protector 10 so that the color will indicate the contents of the container 1. If the product is to be used by a visually impaired patient, for example, which may include a patient requiring CAPD, protrusions, which can be felt by the user 2, can be located on the pull ring 14 of the protector 10, if desired. Due to the structure of the protector 10 and material used, the container 1 including the protector 10 can be removably sealed, for example, on any of the ports 12a, 12b and/or 12c of the container 1. In the alternative, the protector 10 can be removably sealed to the adaptor 40 extending from a fluid tube 32 and can be terminally sterilized using steam sterilization. A further sterilization step with ionizing radiation may not be required. Due to thickness and material composition of the protector 10, steam can easily penetrate the top 22 of the protector 10 sterilizing the interior of a port 12a or a connector, such as the adaptor 40. Additionally, the protector 10 provides the necessary elastomeric properties required by such a product. In this regard, an elastomeric material is chosen that will return substantially to the original shape after having been stretched or maintains a significant retraction force long after the deformation step. In order to maximize processing efficiency, a melt processable rubber, thermoplastic elastomer, is used. The thermoplastic elastomer should provide needed processability. Additionally, the thermoplastic elastomer may be chosen to provide hydrophilicity which provides steam permeability. Referring now to Figure 5, a membrane tube 32 is generally illustrated which can comprise or be connected to a port, such as one of the ports 12a, 12b and 12c of Figure 1. The membrane tube 32 is generally cylindrical having a passageway therethrough and a dividing wall 34 intermediate the open ends 36a and 36b. While the tube 32 is illustrated as a separate component of the assembly, the tube 32, of course, may be integrally formed in the container 1 or otherwise secured within the container 1 at one or more of the ports 12a, 12b and/or 12c. Referring now to Figures 6-8, the adaptor 40 is generally illustrated. A first end 42 is open forming a wide mouth for receiving the needle, cannula or other injection device. An exterior wall of the open end 42 mates with the interior plug member 26 of the protector 10 when the same is secured thereto as illustrated in Figures 1 and 8. The exterior of the adaptor 40 narrows from the first end 42 to the second end 44. The second end 44 has an exterior diameter which frictionally mates with the membrane tube 32 which may be inserted into the port 12a, for example, of the container 1. The interior diameter of the adaptor 40 at the second end 44 receives an injection site 46, such as a septum, and is secured therein. When the membrane tube 32 is attached to the adaptor 40, the dividing wall 34 prevents the injection site 46 from being forced through the membrane tube 32. Referring now to Figures 7 and 8, a passageway 48 is formed between the first end 42 and the second end 44 of the adaptor 40. The membrane tube 32 is attached to the adaptor 40 within a clearance area 50 defined between a wall 52 extending from the second end 44 and an exterior wall 54 which may at least partially extend over the wall 52. As illustrated in Figure 6, the exterior wall 54 has a substantially square cross-sectional area, and the wall 52 has a substantially circular cross-sectional area. The wall 52 includes a plurality of guides 56 which direct the needle, cannula or other injection device through the injection site 46 and the dividing wall 34 of the membrane tube 32, and secure the injection site 46 within the end 44 of adaptor 40 upon removal of such injection device. The exterior walls 54 are slightly concave so as to provide gripping surfaces for the user 2 of the container 1. The passageway 48 is defined by the first end 42 internally tapering from the end 42 for securing to the plug member 26 of the protector 10. A first portion of the passageway 48 near the first end 42 has a substantially equivalent cross-sectional area and then begins to taper at a point intermediate the first end 42 and the second end 44. The interior of the passageway 48 provides a portion through which the needle, cannula or other injection device may be inserted to a protected area to prevent piercing or puncturing of the container 1 or sticking of a finger of a user 2. Following the insertion of the injection device into the first end 42 having a wide mouth, the passageway 48 then becomes substantially tapered as shown in Figure 8 at a portion of the passageway 48 at which the guides 56 project equidistantly from the side walls towards the interior of the passageway 48. The guides 56 direct the needle, therefore, to pierce the injection site 46 in a desired manner, that is, preferably centrally. The needle then penetrates the injection site 46 which has been secured within the passageway 48 at the end 44 of the adaptor 40. Since the needle is forced through the injection site 46 in a desired manner, the dividing wall 34 of the membrane tube 32 will also be pierced accordingly. Referring now to Figure 9, the injection site 46 is shown secured within the interior diameter of the second end 44 of the adaptor 40. After the injection site 46 is secured in place, the membrane tube 32, if it is separate from the container, may be attached. In the alternative, the adaptor 40 and the injection site 46 may be attached directly to the container 1 as shown in Figure 1 having the membrane tube 32 and/or other connector secured to one of the ports 12a as illustrated. As illustrated in Figure 9, the protector 10 is removably sealed to the interior passageway 48 of the adaptor 40. To protect the adaptor 40, the injection site 46 and the interior surfaces of the membrane tube 32 and the dividing wall 34 from touch contamination and other sterility issues, the protector 10 is positioned thereover. Due to the structure of the protector 10, the entire unit--the adaptor 40, the protector 10, the injection site 46 and the tube 32 along with the container 1--can be steam sterilized. Therefore, the entire system may be sterilized with the integral removable protector 10 connected to the adaptor 40. To use, the passageway 48 of the adaptor 40 provides a funnel-like guide which may accept a variety of injection devices. Prior to inserting such an injection device, the pull ring 14 of the protector 10 may be removed by holding the exterior wall 54 of the adaptor 40 and pulling the ring 14 for removal of the protector 10 from within the adaptor 40. In a preferred embodiment, the protector 10 includes the pull ring 14 having the configuration shown in Figure 2. However, of course, other configurations may be implemented. In addition, alternatively, the protector 10 may be a peelable film having a tab which the user may use to peel the heat-sealed peelable film from the adaptor 40. As previously discussed, the adaptor 40 as illustrated includes the positive-stop internal guides 56 focusing the needle or other injection device within the adaptor 40 to penetrate the injection site 46 in a desired manner. The membrane tube 32 may, therefore, be penetrated in the same predetermined manner. In addition, an exterior guard 58 of the adaptor 40 preferably encompasses the first end 42 so as to protect fingers of the user 2 of the system when initially inserting the needle into the first end 42. The adaptor 40 is preferably made of a rigid non-PVC, non-DEHP material, such as a thermoplastic material (TPM), for example, polycarbonate. A TPM can provide rigidity for the needle inserted therein preventing puncture or piercing of same. A TPM further provides stability during use as well as promotes proper sealing between a generally softer material used for the membrane tube 32. A TPM also provides a bond between the adaptor 40 and the injection site 46 when secured in the adaptor 40. The adaptor 40, may be a single piece with the injection site 46 press fit therein or, in the alternative, the adaptor 40 may be a two-piece arrangement having a snap fit or friction weld. In this arrangement, the injection site 46 is first placed in the adaptor 40 and then the adaptor 40 is integrally formed. The adaptor 40, after inserting the injection site 46 and covering with the protector 10, may be sealed into the tube 32 as illustrated in Figure 9. The injection site 46 may be stamped or compression molded from either a natural rubber or a synthetic rubber. The material of the injection site 46 is dependent upon the application, such as whether resealability, for example, is required. The injection site 46 is generally disc-shaped and secured between the adaptor 40 with a pinch fit, or cut-shape and insert molded into the adaptor 40. At least a portion of the adaptor may be color coded to provide a visual means for identifying product in the container.

Claims: A device comprising a combined adaptor and port protector attachable to an end of a tubular port (32) of a container, the adaptor having a longitudinal interior passage therethrough and including an open end opening into a mouth portion (42), an opposite end portion (44) for insertion in a tubular port (12a, 12b, 12c), the opposite end portion having a tapering interior diameter, and a middle portion between the mouth portion (42) and the opposite end portion (44), the port protector (10) comprising a cap portion (20) including a top (22) and side walls (24), which extend around the exterior of the open end (42) of the adaptor, and removal means (14) extending from the cap portion (20) for allowing removal of the cap portion from the adaptor, characterised in that the mouth portion (42) is wide relative to the opposite end portion (44) and the middle portion is a curved narrowing, tapered portion joining the wider mouth portion (42) to the opposite end portion (44), an injection site (46) is received in the opposite end portion (42), which, in use, directs a cannula, inserted in the open end portion (42) to the injection site, and the cap portion defines an interior having a plug member (26) removably and sealingly engaged in said open end portion (42). The device of Claim 1 wherein the adaptor includes a guard (58) encompassing the open end (42) and having a diameter larger than the middle portion, for protecting the fingers of a user holding the adaptor at the middle portion. The device of Claim 1 or 2 wherein the removal means includes a ring (14) that extends from opposite side walls (24) of the cap portion (20). The device of Claim 3 wherein the ring (14) extends in a plane parallel to a plane defined by a top (22) of the cap portion (20). The device of any preceding claim wherein at least the cap portion (20) is constructed from a thermoplastic material and the top (22) has a sufficiently thin cross-sectional thickness to allow steam to pass through the top (22) into the adaptor (40) during steam sterilization. The device of Claim 5 wherein the entire protector (10) is constructed from the same material. The device of any preceding claim wherein at least portions of the adaptor and/or the protector (10) are color coded. A container (1) assembly comprising a container having an interior for housing a solution and at least one port (12a,12b,12c); a tubular member (32) having a passageway providing fluid communication with the interior of the container (1) through the port; and a device according to any preceding claim having said opposite end (44) of the adaptor (40) connected to the tubular member (32). The device of any preceding claim, wherein the tapering interior diameter adjacent said opposite end (44) is smaller than the interior diameter of said opposite end. The device of any preceding claim, wherein the exterior wall of the middle portion (54) has a substantially square cross-section.

Inventors: ASWAD ANDREW D, BALTEAU PATRICK, CHAN EDDIE, FORMAN HUGH M, HENAUT ERIC, HILLER THOMAS D, PELUSO FRANCO, SAVERS DALE, SILVESTRI JOYCE, WALSH LISA S, WISNIEWSKI SANDRA W, WOO LECON, ASWAD, ANDREW D., BALTEAU, PATRICK, CHAN, EDDIE, FORMAN, HUGH M., HENAUT, ERIC, HILLER, THOMAS D., PELUSO, FRANCO, SAVERS, DALE, SILVESTRI, JOYCE, WALSH, LISA S., WISNIEWSKI, SANDRA W., WOO, LECON
Applicants: BAXTER INT, BAXTER INTERNATIONAL INC.
Application year: 1994
Main classification: A61J1
IPC codes: A61J1